Fix PATH corruption on Unix/Linux: use os.pathsep instead of hardcoded semicolons

[YusDyr]

Summary

• Replace hardcoded ";" with os.pathsep in library_loader.py lines 104-105 and 120-121
• os.pathsep is : on Unix/Linux/macOS and ; on Windows — correct for both platforms

Problem

The current code unconditionally uses ; (Windows PATH separator) when appending to os.environ["PATH"]. On Unix systems this corrupts PATH for the entire process and all child subprocesses, making executables in later PATH entries unreachable.

Real-world impact: In Home Assistant (Linux/Docker), importing PyOgg causes /bin/date, /bin/ln, /bin/stat to become unavailable in shell subprocesses, while /usr/bin/ffmpeg (before the corruption point) still works. This creates extremely confusing failures in unrelated components.

Fix

-os.environ["PATH"] += ";" + ";".join((os.getcwd(), _here))
-if paths: os.environ["PATH"] += ";" + ";".join(paths)
+os.environ["PATH"] += os.pathsep + os.pathsep.join((os.getcwd(), _here))
+if paths: os.environ["PATH"] += os.pathsep + os.pathsep.join(paths)

Applied to both load_other() and load_windows() methods.

Fixes #118

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